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Ultra-Trail Snowdonia by UTMB
164km164106km10678km7856km5625km25

UTS 100K

UTMB World Series
106.0km
May 15
Llanberis,
United Kingdom
utmb·source

Race Pace Calculator · GPX Analyzer · Trail Finder

Other races: United Kingdom

Read

  • Types of Runs and What Each Workout Actually Trains
  • Hill Training for Trail Runners: Train the Descents
  • Downhill Running Muscle Damage: Why Descents Wreck Quads

Full calendar: United Kingdom100K trail race calendar

UTS 100K · Race profile

Distance
106km
FlatKM
166.4
Max
1047m
Min
61m

About UTS 100K

UTS 100K is the 106km ultra trail at Ultra-Trail Snowdonia by UTMB 2026 (Llanberis, United Kingdom). The race starts on May 15, 2026.

Race strategy

Hold a steady pace and save energy for every section.

  • 819m descent. Go easy, save your quads.
  • Steep 38% wall. Control your pace and stay focused.
  • Final 707m descent. Save your legs to go all out on it.
  • Long race. Control your HR and effort. Early mistakes cost the most.
  • Control your HR on the first mountain, save your quads on the descents until 78.6km, then run your race pace, and go all out on the final descent from 92.8km.
  • Start · 0.0km–1.1km · Race-day nerves push your heart rate up: don't follow the crowd, find your own rhythm.
  • Settle in · 1.1km–11.7km · Climb of 878m, descent of 617m averaging 13%. Ease in: hold back more than feels necessary. The race is still ahead. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Hike the steepest pitches.
  • Work · 11.7km–50.1km · Descent of 622m averaging 19%, descent of 413m averaging 18%, descent of 819m averaging 9%, high point 1050m. Plus 3 more climbs and 1 descent. This is where the race is built: steady, solid effort. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Running pays off here: run wherever you can. Hike the steepest pitches.
  • Fade · 50.1km–92.8km · Descent of 760m averaging 10%, climb of 1026m, descent of 901m averaging 14%. Plus 3 more climbs and 1 descent. Your energy fades, and that's normal: hold a steady effort and stop counting the miles. Climb by heart rate or breathing, not pace. This descent is hard on the legs: short steps, stay in control, poles if you have them. Hike the steepest pitches. Your heart rate drifts down on its own: don't chase your early-race numbers, go by feel.
  • Home · 92.8km–102km · Descent of 707m averaging 8%. No heroics: settle back into your own effort and hold it to the line.

Course

By gradient, 37% of the distance is uphill, 43% downhill and 20% flat. The longest climb runs 11.2km at an average 9.2% grade (1026m of vertical). The longest descent runs 9.4km at an average 8.7% grade (819m of vertical). The steepest climb averages 40.6% over 0.3km. The steepest descent drops at 37.3% over 1.1km. Surface: 41% trail, 26% technical, 23% smooth, and 5% road. Flat-equivalent effort: 166.4 FlatKM.

Summits

The highest summit on the course is Snowdon (1085m), 72.5km from the start. Other named summits along the route: Carnedd Llewelyn (1064m) and Carnedd Dafydd (1044m).

Poles

Trekking poles are strongly recommended: about 16.6km of the course is steep enough for them to pay off.

Quad damage

Quad damage risk is high (index 62 of 100), with 48% of the load in the first half: 7 critical descents, the last of them run on already damaged legs. Downhill-specific preparation and a controlled early pace pay off here.

  • Control your HR on the first mountain, save your quads on the descents until 78.6km, then run your race pace, and go all out on the final descent from 92.8km.
  • #2 · 6.8–11.7 km · 617 m D−, -12.6% · 90.1 km ahead → control
  • #5 · 14.7–18.0 km · 622 m D−, -18.8% · 83.9 km ahead → control
  • #4 · 19.8–22.1 km · 413 m D−, -18.3% · 79.8 km ahead → control
  • #1 · 27.0–36.4 km · 819 m D−, -8.7% · 65.5 km ahead → control
  • #7 · 42.3–44.4 km · 278 m D−, -13.4% · 57.5 km ahead → control
  • #3 · 53.7–61.2 km · 760 m D−, -10.1% · 40.7 km ahead → control
  • #6 · 72.3–78.6 km · 901 m D−, -14.3% · 23.3 km ahead → control
  • 92.8–101.9 km · 707 m D−, -7.8% · 0.0 km ahead → free
  • Plus 1 more notable descent not listed: your pace.

Results

209 finishers completed the 2026 edition. Men's winner: Paul Cornut Chauvinc (France) in 11:51:43. Women's winner: Ariane Wilhem (Switzerland) in 16:02:48.

This page has the full results and splits, a pacing and nutrition planner, a gradient matrix, an interactive elevation profile and historical weather for UTS 100K.

Other distances of Ultra-Trail Snowdonia by UTMB 2026UTS 100M (164km)·UTS 80K (78.0km)·UTS 50K (56.0km)·ERYRI 25K (25.0km)

Other editions of UTS 100K2025

Official websitesnowdonia.utmb.world